why does my cart have REV

[atari70s]

i know REV. mean like revision on it . or somethign along those lines but whats is the deal with REV. 0 ? it says REV. 0 i never seen a 0 before ive seen 1-like 13 or 17 but never a 0

[The Night Phantom]

Perhaps it's the original, unrevised version.